diff options
Diffstat (limited to 'boot_cpld')
| -rwxr-xr-x | boot_cpld/boot_cpld.v | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/boot_cpld/boot_cpld.v b/boot_cpld/boot_cpld.v index 3c53a7992..1769f7c03 100755 --- a/boot_cpld/boot_cpld.v +++ b/boot_cpld/boot_cpld.v @@ -47,6 +47,15 @@ module boot_cpld assign CPLD_CLK = CFG_CCLK; assign DEBUG[8:0] = { CLK_25MHZ, SD_nCS, SD_CLK, SD_Din, CFG_CCLK, CFG_PROG_B, CFG_INIT_B, CFG_DONE, CFG_Din}; + + // Handle cutover to FPGA control of SD + wire fpga_takeover = ~CPLD_misc; + wire SD_CLK_int, SD_nCS_int, SD_Din_int, CFG_Din_int; + + assign SD_CLK = fpga_takeover ? START : SD_CLK_int; + assign SD_nCS = fpga_takeover ? MODE : SD_nCS_int; + assign SD_Din = fpga_takeover ? DONE : SD_Din_int; + assign CFG_Din = fpga_takeover ? SD_Dout : CFG_Din_int; spi_boot #(.width_set_sel_g(4), // How many sets (16) .width_bit_cnt_g(6), // Block length (12 is faster, 6 is minimum) @@ -61,10 +70,10 @@ module boot_cpld .reset_i(POR), // To SD Card - .spi_clk_o(SD_CLK), - .spi_cs_n_o(SD_nCS), + .spi_clk_o(SD_CLK_int), + .spi_cs_n_o(SD_nCS_int), .spi_data_in_i(SD_Dout), - .spi_data_out_o(SD_Din), + .spi_data_out_o(SD_Din_int), .spi_en_outs_o(en_outs), // Data Port @@ -79,7 +88,7 @@ module boot_cpld .cfg_init_n_i(CFG_INIT_B), .cfg_done_i(CFG_DONE), .cfg_clk_o(CFG_CCLK), - .cfg_dat_o(CFG_Din) + .cfg_dat_o(CFG_Din_int) ); endmodule // boot_cpld |